Flexible printed circuit board and electronic device

A flexible printed circuit board, comprising:

• a substrate comprising a resin base material;
• and
• signal wires on the substrate,
• the resin base material being formed to define:
• a first segment having a first width;
• and
• a second segment having a second width larger than the first width,
• the signal wires extending in a first direction in the first segment and changing direction so as to extend in a second direction different from the first direction in the second segment;
• the width of the first segment and the width of the second segment being a dimension of the resin base material perpendicular to the first direction,
• the flexible printed circuit board further comprising:
• a connecting portion that is formed in the second segment at an end of the signal wires for transmitting an electric signal;
• a breakage detection portion in which the signal wires are not disposed, formed at an edge of the second segment, and at an inside of a curve defined by the change of direction of the signal wires from the first direction to the second direction;
• and
• a through hole formed in the second segment, between the breakage detection portion and the signal wires in the second segment,
• the connecting portion extending along a side edge of the resin base material in the second segment that extends in the first direction.